server.py

if __name__ == '__main__':
import socket
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.bind(('localhost', 8001))
sock.listen(5)
while True:
    connection, address = sock.accept()
try:
    connection.settimeout(5)
buf = connection.recv(1024)
if buf == '1':
    connection.send('welcome to server!')
else:
    connection.send('please go out!')
except socket.timeout:
    print 'time out'
    connection.close()